Drum traps



Oct. 5 1926.

G. o. MILLER DRUM TRAPS Filed Deb. 18, 1922 JG 55. i attoznaq 1 10605217Q Patented Oct. 5, 1926.

UNITED STATES PATENT QFFicE.

DRUM TEARS.

Application filed December 18, 1922. Serial No. 607,583.

My invention relates to improvements in drum traps, such as are employedbetween the waste of a bathtub and the sewer of a building, 7

.Owing to the fact, that traps of this kind are placed between joistsforming part of the floor of a building and are intended to be concealedby the flooring placed on the joistsa-nd the ceiling applied to thelower. edges of the jloists, 'insufficient space s allowed under epresent day constructions for the use of a rtrap .c'apa-ble.offfurnishing the proper water seal.

Man-y. buildings are constructed with joists having ,a width .or depthofsix or eight inches, and the water seal within the trap is so smallthat it becomes easily siphoned, thus allowing the gases from the sewerto pass upwardly through the drain pipe into :the bathroom. 1

It is the pur ose of my invention .to provide a trap wliich will take upcomparatively little space especially in a vertical direction, yetfurnish a water seal which .can not be broken by siphonic ,action.

Another object of my invention is to provide a drum .trap providing .awater seal of a height that could only be furnished in the present type(of drum "trap ,whenljoists several inches wider than ordinarilyemployed -.in;dwellings are ,used. 3

A further object of invention is to provide a trap of this kind with awater 'seal in which the 'seal extends upwardly to a level above theoutletofthe trap, thereby giving the water seal a free overflow.

A still further object is to provide .a trap of this kind with-anintennal waterseal and with an outlet which is positioned considerablylower than .the level of the seal, thus enabling the use of the trapbetween joists having a double floor applied thereto, atthe same timeassuring a larger and more effective water seal and positioning theinlet pipe above the ceiling applied to the lower edges of the joists,even though said joists are only six inches in width.

With the above and other objects in view the invention consists in thenovel features of construction and in the arrangement and combination ofparts to be hereinafter described and more particularly pointed out inthe subjoined claim.

In the drawings Fig. 1 is a sectional elevation through a Liraconstructed in accordance with m in=- vention, the same being shown inposition in a floor dividing two stories of. a building.

' Fig. 2 is a horizontal section taken on line 22, Fig. 1.

The floor dividing the two stories of a building comprises joists 3, ofwhich one is shown at the right of the trap, another being spaced anapproved distance to the left of the trap, cleats 4t fastened to thesides .of these joists, and boards 5 which are nailed to said cleats andthrough which an opening '6 is formed for the .drum trap 7, consideredas a whole. placed,and tile 9 covers this cement and the upper edges ofthe joists 3.

While the drawing illustrates one form .of floor, where a wooden floorordouble wooden floor is used, flooring material is applied directly tothe upper edges of the joists.

The construction of the building forms no part of my invention, but inthe particular construction shown the ceiling 10 of the story below isapplied to thelower edges of the joists 3. I j

The [drum trap 7 comprises a body portion or casing 11 which ispreferably cylin- .drical'and reduced at its lower end, as at 12 andwherethe peripheral wall of the reduced portion of the ,trap swellsoutwardly -,or merges into the enlarged upper portion thereof, a conicalinternal wall 13 extends upwardly into the interior rojf the trap towithin a short distance of the upper ,end of ,the body portion ,7,theupper end of this nonical wall being open, as at 14 and the lower endmeeting and merging into the wall of the casing where the reduced lowerportion swells outwardly and merg'es into the larger portion of thecasing. This coni .cal wall is made concavo-convex in vertical extensionwith its inner surface convex and forming a smooth continuation of theinner surface of the reduced lower portion of the casing. while theouter surface of said conical wall is concaved in Vertical extension andfurnishes a comparatively wide annular space between said conical walland the surrounding portion of the casing.

15 is an outlet boss formed on the body of the trap at one side thereofand this furnishes an escape or outlet opening for the trap arranged ina plane considerably below the upper end. of the conical wall 13, whichmay be termed a trap wall, The wall of raises On the boards 5, cement 8is this outlet boss along its lower portion merges into the conical wallat the base thereof and therefore a smooth unobstructed opening isprovided from the annular space around the conical wall outwardlythrough said boss. The particular formation of the conical wall and themanner of connecting the same to the casing provides a self-cleansinginlet for the trap, especially since the inlet opening in the bottom ofthe trap is axially arranged and has a free unobstructed passageprovided through the trap. The siphonic action taking place, when wastepasses through the trap, assures the drawing out of all dirt with thewaste passing through the trap. An outlet pipe 16 leading to the seweris threaded into the outlet boss 15, or this pipe may be otherwiseapplied thereto.

The bottom of the trap has an axial opening 1'? and extending upwardlyaround this opening is an annular flange 18, the interior of which formsa continuation of the opening 17. Said opening is internally threaded toreceive a nipple 19 which has an elbow 20 threaded thereon, and enteringthe elbow 20 is an inlet pipe 21, which leads to the waste of a bathtub.

The body portion of the casing 7 of the trap is provided at its upperend with an in ternal flange 22, and the upper edge of its wall isarranged flush with the top of the tile or other flooring. Threaded intothe upper end of the casing or body portion of the trap is a cover 23.which slightly overlaps a portion of the flooring material, as at 2%,and has the usual square projection 25 by means of which the cover canbe conveniently threaded into the casing or body portion of the trap toclose the upper end of the same or be as readily removed so access maybe easily had to the interior.

By having an internal trap wall 13 whose upper end is considerably abovethe outlet opening of the casing, a comparatively short trap is providedand a water seal furnished of considerable height, the result being thatthe water passing out through the outlet pipe would not, under anycondition, create sufficient suction to break the seal and cause thetrap to become siphoned. Furthermore, by reason of this construction,comparatively little space in height is occupied by trap wall, whichforms a water space extending from the lower wall of the casing or bodyportion of the trap to the, upper end of said wall, a deep water seal orspace is provided, and by reason of the outlet 15 being at acomparatively low point, a free dis charge from this water space isfurnished. Moreover, the relative arrangement of these parts permits ofconstructing a trap of comparatively small dimensions, particularly soin respect to its height. It, therefore, occupies only a small spacebetween the floor and ceiling, in contradistinction to the'old form oftrap in which the length or height of the body must be increased inorder to enlarge the height of the water seal, and in any event saidwater seal, even though the trap is placed between oists ten inchesinwidth, is comparatively shallow and therefore easily effected bysyphonic action;

lVhile I have shown a trap of cylindrical formation in cross section,any other cross sectional formation may be given the same if desired.

Having thus described my invention, what I claim is r A drum trap havinga cylindrical casing with an inlet at its lower end and a lateraloutlet, a conical internal wall extending upwardly into said casing andspaced from the surrounding wall of said casing, said conical wallbeing' concavo-convex in vertical extension and having the convexsurface on its inner side and the concaved surface on its outer side,thereby assuring a self-cleansing trap and a comparatively wide annularspace around said conical wall.

In testimony whereof I affix my signature.

GEORGE O. MILLER.

